mongodb mojo: building a basic perl app

Stephen Steneker (@stennie)

#MongoDB

MongoDB Mojo: Building a basic Perl app

Community Support Manager, MongoDB

MongoDB is a ___________ database

•  Document oriented

•  Open source

•  High performance

•  Horizontally scalable

•  Full featured

High Performance

•  Written in C++

•  Extensive use of memory-mapped files i.e. read-through write-through memory caching.

•  Runs nearly everywhere

•  Data serialized as BSON (fast parsing)

•  Full support for primary & secondary indexes

•  Document model = less work

Depth of Functionality

Scal

abili

ty &

Per

form

ance

Memcached

MongoDB

RDBMS

Database Landscape

Full Featured

•  Ad Hoc queries

•  Real time aggregation

•  Rich query capabilities

•  Strongly consistent

•  Geospatial features

•  Support for most programming languages

•  Flexible schema

What We Will Build:

•  “Library”: A demo application –  Users –  Books –  Authors –  Publishers

Photo by Jessica Spengler: http://www.flickr.com/photos/wordridden/6798197508/

What We Will Need:

•  MongoDB –  http://www.mongodb.org/downloads

•  CPAN Modules: –  https://metacpan.org/module/Mojolicious::Lite –  https://metacpan.org/module/MongoDB

Inside the CPAN Distribution: Requirements

•  Moose

•  DateTime

•  Digest::MD5

•  Tie::IxHash

•  XSLoader

•  boolean

Inside the CPAN Distribution: Client

•  MongoDB::MongoClient –  new in version 0.502 (Nov-2012) –  “Safe” (write-acknowledged) by default –  Encapsulates connection and server info

Inside the MongoDB CPAN Distribution: Classes

•  MongoDB::Database –  Represents a database (namespace) on the MongoDB server

•  MongoDB::Collection –  Represents a collection (table? kinda) in a database

•  MongoDB::Cursor –  Retrieves documents (rows? kinda) from a collection

MongoDB Documents

•  Documents live in Collections

•  Documents have no pre-defined schema

•  Documents have key-value pairs, like Perl hashes

•  Documents can have nested structure (arrays and other documents), like Perl hashes

•  Documents look something like JSON

MongoDB Documents

{ 'title': 'Fellowship of the Ring, The', 'author': ObjectId("507ffbb1d94ccab2da652597"), 'language': 'English', 'genre': ['fantasy', 'adventure'], 'publication': { 'name': 'George Allen & Unwin', 'location': 'London',

'date': new Date('21 July 1954'), }

}

Class Delegation Structure

MongoDB::Cursor Documents

has()!

MongoDB::Collection

has()!

MongoDB::Database

has()!

MongoDB::MongoClient

Application

Let’s Build It!

Building the Library


Remember the Genres? {

'title': 'Fellowship of the Ring, The', 'author': ObjectId("507ffbb1d94ccab2da652597"), 'language': 'English', 'genre': ['fantasy', 'adventure'], 'publication': { 'name': 'George Allen & Unwin', 'location': 'London',

'date': new Date('21 July 1954'), }

}

What’s on CPAN?

•  ODMs (Object Document Mappers) –  Like ORMs but simpler

Mongoose

•  Based on MongoMapper from Ruby.

•  MongoDB Docs --> Moose objects.

http://search.cpan.org/~rodrigo/Mongoose-0.23/ (28-Jan-2013)

MongoDBI

•  Very Perlish

•  Moose-like Syntax

http://search.cpan.org/~awncorp/MongoDBI-0.02/ (17-Oct-2012)

MongoDB::Async

•  Tracks upstream MongoDB Distribution

•  Uses Coro and libev for asynchronous queries

•  (Mostly) drop-in replacement for MongoDB driver

http://search.cpan.org/~nyaknyan/MongoDB-Async-0.503.2/ (22-Dec-2012)

Where to from here? •  Learn more about MongoDB

–  http://docs.mongodb.org

•  Learn about the MongoDB Perl API –  https://metacpan.org/module/MongoDB::Tutorial

•  Community support –  http://stackoverflow.com/tags/mongodb –  https://groups.google.com/group/mongodb-user

•  MongoDB University –  http://education.mongodb.com/

[email protected]

Stephen Steneker (@stennie)

#MongoDB

Thank You!

mongodb mojo: building a basic perl app

Technology